Fixed some build tags in vendor libs

core/dynlib/lib_unix.odin

@@ -1,4 +1,4 @@
-//+build linux, darwin, freebsd, openbsd
+//+build linux, darwin, freebsd, openbsd, netbsd
 //+private
 package dynlib
 

vendor/ENet/unix.odin

@@ -1,4 +1,4 @@
-//+build linux, darwin, freebsd, openbsd
+//+build linux, darwin, freebsd, openbsd, netbsd
 package ENet
 
 // When we implement the appropriate bindings for Unix, the section separated

vendor/directx/dxc/dxcdef_unix.odin

@@ -1,4 +1,4 @@
-//+build linux, darwin, freebsd, openbsd
+//+build linux, darwin, freebsd, openbsd, netbsd
 package directx_dxc
 import "core:c"